On Tue, Feb 09, 2021 at 08:54:10AM +0000, Wozniak, Sebastian via Linuxptp-users wrote:
> I'm facing issue with ptp4l that ptp is synchronazing for few > seconds and then its going out of sync and then its trying to sync > again and this thing is repeating all the time, in logs its look > like wave. There is no such "wave" in the log you posted. The numbers look quite good actually. The only strange thing is that the GM appears to be increasing the rate of Sync messages. You can see that output switches from 1/Sync to "summary" mode with Root Mean Square (rms) statistics. Here is a snippet from your log, but aligning the values: ptp4l[2405.721]: master offset 4 s3 freq +32157 path delay 5451 ptp4l[2406.730]: master offset -22 s3 freq +32133 path delay 5451 ptp4l[2407.729]: master offset 48 s3 freq +32196 path delay 5451 ptp4l[2409.661]: rms 38 max 56 freq +32093 +/- 40 delay 5451 +/- 0 ptp4l[2410.696]: rms 54 max 74 freq +32161 +/- 33 ptp4l[2411.719]: rms 36 max 64 freq +32183 +/- 16 delay 5451 +/- 0 ptp4l[2412.875]: master offset 34 s3 freq +32186 path delay 5451 ptp4l[2413.902]: master offset -38 s3 freq +32124 path delay 5451 As you can see, the instantaneous offset remains within +/- 100 nanoseconds, the frequency offset is stable at 32.1 ppm, and the delay is constant at 5.45 microseconds. Those are good numbers, if you ask me. But changing the Sync rate is bizarre behavior. I will bet that the GM is not running linuxptp. > Also there is a second issue that first offset is very high and its > like this every time when I'm starting ptp4l. That only means that your PHC cold booted with some random time. You can initialize it with the phc_ctl program if you like. HTH, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
